"Some kind of meat", yes. I can't imagine it to be of high quality, so hesitate to call it "proper". AFAIK the main noticable difference is whether the kebab is made of ground meat or not. The latter being more expensive and supposedly of higher quality. But in the end it's mostly going to be factory meat so it makes no difference, IMHO (there are exceptions of course: https://www.meraba.de/).